Intensifier for spark-plugs



M. L. DUNBAR.`

INTENSI-FIEH FOR SPARK PLUGS.

APPLICATION man Nov. 24, |919.

1,866,251. Patented Jan.18,1921.

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MAHLON L. DUNBAR, OF NORWALK, OHIO.

INTENSIFIER FOR SPARK-PLUGS.

Specicaton of Letters latent.

Patented Jan. 18, 1921.

Application led November 24, 1919. Serial No. 840,246.

To all whom, t may concern Be it known that I, MAHLON L. DcNAR, a cltlzen of the United States, residing at Norwalk, in the county of Huron and State of Ohio, have invented new and useful Improvements in Intensifiers for Spark-Plugs, of which the following is a` specification.

The object of my present invention is to provide an intensifier for spark plugs, of simple7 compact and durable construction, and one in which provision is made for adequately protecting the transparent'sleeve against changes in temperature and extraneous blows without detracting in any measure from the efficiency of the device.

To the attainment of said object the invention consists in the peculiar and advantageous intensifier hereinafter described and definitely claimed.

In the accompanying drawings, hereby made a part hereof:

Figure l is a side elevation, and Fig. 2 a plan view of my novel intensiiier.

Fig. 3 shows the same partly in diametrical section.

Fig. 4 is an end elevation.

Fig. 5 is a transverse section taken in the plane indicated by the line of Fig. I-i with the intermediate tion. k

Similar numerals of corresponding parts in the drawings.

Among other elements my novel intensiA lier comprises an'intermediate electrode 1, prefe 'ably rod-like as shown. and end electrodes 2 in the form of screws and susceptible/of being uniformly adjusted toward and from the electrode l as occasioii demands. Each'electrode 2 is kerfed at its outer end for the application of a screw-driver. or other adjusting device. and each bears a spring washer 3. a loclenut 4 and'a bind ing nut 5. One electrode 2 is also. by prcference, equipped with an angular coupling member (l. the yinner arm of which is mounted on the electrode and interposed between the nuts 4 and 5 thereof. and the outer arm adapted tobe mounted and 'secured on the exterior electrode of a spark plug. Then deemed expedient a spring washer 2i may be mounted on the last-named electrode between the nuts 4 and 5. as shown.

The electrodes 2 are tlireaded into a dielectric housing T in which is a diametrical bore 8 and which carries the intermediate elec- 7 electrode in eleva reference designate all of the vlcws of trode 1, arranged in intersecting relation to the bore e, Figs. 3 and 5.

f Surrounding the housing T is a transparent 4sleeve 9, preferably 'of glass, which is of less lengththan the housing in about the proportion illustrated, and at the ends of the said sleeve'Q are annular yielding members or gaskets lo, preferably of rubber. These annular members or gaskets l() are interposed between the ends of the sleeve 9 and heads 11, preferably of n1etal,.\vhich are loose on the electrodes 2 and are flanged as indicated by 12. so as to surround and protect the end portions of the sleeve 9.and the gaskets l() as well as the.joints between the sleeve and gaskets. l

It will be apparent from the foregoing that notwithstanding the simplicity and compactness of my improved device.l the same is calculated to effectively intensify'tlw spark of a plug to which it is applied; also, that whilethe gap in the intensifier is visible through the transparent sleeve fl and the bore H in the dielectric housing i, air is elfectually excluded from the gap and at the saine time free expansion and contraction of the transparent sleeve El is permit ted. with the result that the liability of the said sleeve being fractured while in use is reduced to a minimum.

llaving described my il'lvention, what l claim and desire to secure by Letters latent. is:

An intensifier comprising a lielectric housing of even exterior diameter throughout its length and provided with a central diainetrical bore. an intermediate diametrical electrode disposed in said housing at:

right-angles to and intersecting said bore, longitudinal central end electrodes threaded in said housing and having their inner ends disposed in said boreopposite the intermediate elect rode` a transparent sleeve. of less length than the housing. surrounding the same.' heads secured on the end electrodes and against the ends ofthe housing and hav ing lflanges reaching inwardly beyond the ends of the transparent sleeve, and gaskets surrouiuling the emlportions` of the housing and arrangedv in the. heads and interposed between the ends of the transparent sleeve and the heads.

ln testimony whereof l affix my signature.

MAnLoN L. Douma.

ioo 

